The Democratic National Committee is set to meet Saturday morning in Atlanta, where 442 voting members will select from a seven-candidate field led by former Labor Secretary Tom Perez and Minnesota Rep. Keith Ellison.

Aides and vote counters for both Perez and Ellison see a tight race, which could require multiple rounds of balloting.

The gathering kicks off at 10 a.m., with each of the candidates allowed 10 minutes for nominating speeches.

As long as all of the eligible DNC members participate, it will take 222 votes to win.

Democrats on Capitol Hill and in state offices set the party’s policy agenda, but the party chair heads the infrastructure that formulates the party platform and supports its presidential candidates, state parties and local officials.

The chair also plays a major role in fundraising for the party and serving as a high-profile public face.

The election in part has been a proxy war between Sen. Bernie Sanders’ allies and those more closely aligned with Hillary Clinton and former President Barack Obama.

The Vermont senator endorsed Ellison early, and the progressive organizations that backed Sanders during the 2016 Democratic presidential primary have all followed suit.

Perez’s progressive bona fides haven’t been questioned, but he’s seen by the left as less in touch with its activist base.

Ellison’s allies made the case Friday night that he is the only candidate who can bridge the party’s divisions and connect its grassroots supporters to its official infrastructure.

Larry Cohen, the chairman of Sanders’ new organization Our Revolution and former head of the Communications Workers of America, said Perez “didn’t win over anyone” on the Sanders-aligned left during the race for DNC chair.

“If they didn’t win them over in three months of campaigning, why would they be able to win them over the day after tomorrow?” Cohen asked. “That’s what I would be worried about.”

Still, Perez, who made gains by campaigning in rural and red states – and won over full DNC delegations in some places – is broadly seen as the favorite after picking up the endorsement of South Carolina Democratic Party Chairman Jaime Harrison, who until recently had been the race’s third-place contender.

South Bend, Indiana Mayor Pete Buttigieg and Idaho Democratic Party Executive Director Sally Boynton Brown are also expected to pick up votes in the first round of balloting late Saturday morning.

Television analyst Jehmu Greene, Air Force veteran Sam Ronan and attorney Peter Peckarsky are also running, although none is expected to gain much, if any, support from DNC voting members.

Perez has sold himself as a turnaround artist, arguing the party needs to focus on voting access and down-ballot battles.

“Tomorrow’s race is all about helping people at scale,” Perez told DNC members at a Friday night reception, referring to the need to replicate successful campaign strategies nationwide. “And, when we build these strong parties and when we build these strong partnerships, that’s what we’ll be able to do.”

At the Westin Peachtree Plaza, Ellison rallied his troops with an evening reception where he declared the party would emerge from Saturday’s contest united for a “greater and more important fight.”

“Unity is critically important. We have got to come out of this process together. We have got to come out of this process united,” Ellison said. “No one benefits from us fighting each other other than Trump and all those crazy right-wing governors.”